Move WebInputMethodControllerImpl to core/exported/ & break dependencies.

third_party/WebKit/Source/web/WebViewImpl.cpp

Index: third_party/WebKit/Source/web/WebViewImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebViewImpl.cpp b/third_party/WebKit/Source/web/WebViewImpl.cpp
index 8092ffbbf914888246abb9f3197d8c0605903b76..6916bdb9dce3189b830001d7cd9a0bec97bb68e6 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -171,7 +171,6 @@
 #include "web/PrerendererClientImpl.h"
 #include "web/StorageQuotaClientImpl.h"
 #include "web/WebDevToolsAgentImpl.h"
-#include "web/WebInputMethodControllerImpl.h"
 #include "web/WebRemoteFrameImpl.h"
 #include "web/WebSettingsImpl.h"
 
@@ -3519,9 +3518,11 @@ void WebViewImpl::HidePopups() {
   CancelPagePopup();
 }
 
-WebInputMethodControllerImpl* WebViewImpl::GetActiveWebInputMethodController()
+WebInputMethodController* WebViewImpl::GetActiveWebInputMethodController()
     const {
-  return WebInputMethodControllerImpl::FromFrame(FocusedLocalFrameInWidget());
+  WebLocalFrameBase* local_frame =
+      WebLocalFrameBase::FromFrame(FocusedLocalFrameInWidget());
+  return local_frame ? local_frame->GetInputMethodController() : nullptr;
 }
 
 Color WebViewImpl::BaseBackgroundColor() const {